Fellow Kogyo FOCAS-2000 Instruction Manual page 22

Page. 21
Maintenance and Checking
8
.
Zero-point check ExamZero ppm press Enter
8-1-2.
Be sure to clean the sensor before starting the zero-point check.
Always prepare mineral water.
This may be caused by the dirty detection tube due to aging or contaminated water supplied from the fresh water inlet.
This function is used to check such a stain of the detection tube.
Please check once a month.
Zero-point check by feeding mineral water from the upper lid portion (recommended)
With this, the zero-point check by feeding mineral water from the upper lid portion is completed.
Keep on pressing "Esc" for two seconds or longer.
Press " " twice.
Press "Enter." The TEST mode is set..
Press " ."
Press "Enter." The zero-point check starts.
Open the upper lid and the drain valve and empty the sensor unit.
Close the drain valve, feed mineral water into the sensor unit, and open the drain valve once
more to empty the sensor unit. Press "Enter."
Repeat a set of feeding mineral water into the sensor unit and draining water from the sensor
unit twice or more. Close the drain valve, feed mineral water into the sensor unit, and close
the upper lid. Press "Enter."
Shows a time required until the supplied mineral water becomes stable in the detection tube
(until the oil concentration detector becomes ready to measure the oil concentration).
Measures the concentration of oil in the mineral water.
(You can terminate the measurement anywhere. However, if you do not press the "Esc"
switch for 10 minutes, the oil concentration detector stops measurement.)
Keep on pressing "Esc" for two seconds or longer to stop measurement.
Press "Enter."
"Main Menu" is displayed back.